Skip to main content

Long running task?? SwingWorker to help

I don't know how many people or any one now uses Swing for designing applications in Java. But while reading Java docs in my free time I came across this class called SwingWorker, now many of who work/had worked in Swing might be saying "Whats new in this class"!! Well, nothing is new in there but this class is new for me coz I never worked in Swing, but in my college days I was working on a project using Swing called Visual Java. A NetBeans kind of software, I stopped working on it when I came to know that its already there.. :)
Coming back to SwingWorker. I am writing this post for this class is because this class is really a handy for those who are developing or starting to develop applications using Swing. While developing any software if there is any long running task, we put it in a separate thread, Background thread. So SwingWorker provides us the same functionality adding some methods where we can put our UI manipulation code.
Both the classes provide doInBackground where you should write code for your long running task. SwingWorker provides process method where you can put your code to update application UI. It provides another method done, this method is called when your task is completed. To publish current progress of task it provides another method publish, to which you can pass the data to either process it or current progress of our task.
Following example shows how to use SwingWorker class.
 
class BackgroundTask extends SwingWorker<String, Integer>{
  @Override
  protected String doInBackground() throws Exception {
    // add code for your long running task
    publish(progress);
    return result;
  }
  @Override
  protected void process(List<Integer> chunks) {
    super.process(chunks);
    // add code to update UI 
  }
  @Override
  protected void done() {
    super.done();
    // task completed, add code to perform some action upon it
  }
}


Comments

Popular posts from this blog

Spring AOP : JDK Proxy vs CGLib Proxy

Spring framework is one of the most widely used framework in Enterprise application development. It has so many features such as Dependency injection, Data access integration, MVC, AOP which takes care of most of the boilerplate part of project, and developers can then focus on business logic only.

One of the important feature in Spring is AOP. It is used by almost every enterprise application which is being developed using Spring.

AOP So what is AOP? Definition of AOP -
Aspect oriented programming is a programming paradigm which aims to increase modularity by allowing the separation of cross cutting concerns. Well, my understanding of AOP is - AOP allows us to introduce/join new modules in your project at pre-specified dynamic locations without having to code for it. Traditional examples of AOP is Transaction management, logging etc. You can read more about AOP at here.

This article is for those who know AOP, have used AOP in their projects but do not know how Spring or other DI fra…

Java Tools Plugin for Notepad++

This post and the plugin is outdated. Please use plugin from this link which is updated and allows customization of shortcut key mappings and much more.
Notepad++ is a great free editor. I like notepad++ because its a light weight editor and loads instantly. I use notepad++ for editing many files everyday. One plugin I always wanted was a plugin which lets me compile my java files and execute them from editor itself, but I couldn't find it so I wrote a myself. This plugin can be downloaded from this link.
I am working on this plugin to make it more effective, so that if user have more than one installations of JDK or JRE then user should be able to choose which one to use etc.
This is a simple plugin which has two commands-
Compile - compiles a java file.
Run - executes a java file.
For using this plugin Java must be installed on the system.

Notepad++ Compile and Run Java Programs

Notepad++ is a great file editor. It has many features. The most important feature which I like about Notepad++ is its light weight. It loads up so quickly, that's great. It also provides syntax highlighting for many languages. I use notepad++ to edit general files as well as my simple Java programs.
Although notepad++ provides functionality to run external programs, I prefer NppJavaTools plugin to compile and run Java programs using notepad++.
You can download NppJavaTools plugin from this page - NppJavaTools.

Installation
Installation of plugins in notepad++ is very simple process. All you have to do is copy plugin dll into plugins folder of notepad++ installation directory and restart the notepad++.

Features
This plugin provides following features,


Compile and run your Java files within Notepad++Set custom hotkeys for compiling and running Java CodeLibrary support Compile and RunThis function allows you to run your Java programs to compile and run from Notepad++. Set Custom hotkeysThi…